It stopped working in Firefox, I login with master pass as per usual, it just doesn't respond, no dialog, no error, just playing dumb silent. What a PITA this manager has become lately!

Bitwarden is the one I'm relying on from now on. Forget everything I wrote below. LastPass lost my interest, just no longer reliable. Sorry.

I've been a LastPass user for almost 10 years when I got fed up with the annoyances in Mozilla Firefox and decided to try 1Password and dashlane and even Kee (with KeePass). Turns out LP quirks are still very minor compared to the annoyances with dashlane and all the hyped up managers. Take it from me;
Sorry, you need way more work and years of experience with user-feedback to beat LastPass at this game. They're miles ahead of dashlane and 1password.

If you want true stability with passwd management, use the ESR of Firefox ( https://www.mozilla.org/en-US/firefox/organizations/ ) on Windows 7 x64, don't expect reliability when you're on Microsoft's live test-team (i.e. using Windows 10) or using cutting edge barely tested new browser versions, like FF Quantum, even.